Casing head



Sept. 12, 1933. A, LEMAN 1,926,856

CASING HEAD Filed March 24, 1933 INVENTOR Patented Sept. 12, 1933 1 UNITED STATES PATENT OFFICE CASING HEAD Arthur L. Leman, Toledo, Ohio, assignor to The National Supply Company, Toledo, Ohio, a corporation of Ohio Application March 24, 1933. Serial No. 662,473

Claims. (Cl. 166-14) My invention relates to casing heads, somerecess open upwardly and closed below by times called tubing heads. the bottom extension 21 of the support. The

One object of this invention is to provide a inner edge of the extension 21 is provided with an casing head which is capable of maintaining a upstanding flange 22 which with the extension 21, 60 seal against the pressure between the tubing or and the wall of the support 18 forms the annular tubing coupling and the body of the head at all recess 20.. The lower end of the adaptor ring 5 times. Another object is to provide a casing head has at its lower outer corner an annular recess employing slip-suspension of the tubing with a 23. This recess receives the upper end of a flexipacking above the slips, means for compressing ble or yieldable sealing ring 24 whose lower end the same, and flexible or yieldable sealing means has an annular flange fitting in the annular rebelow the slips to maintain a seal against the cess 20. The sealing ring extends inwardly so pressure between the .tubing or tubing coupling as to closely engage the outer surface of the tuband the body of the head at all times. My ining 9. The sealing ring 24 has a central periphvention also comprises a novel support for a eral groove adjacent to the tubular packer sup- 70 packing ring, the packing ring being flexible or port 18. The upper portion of the sealing ring yieldable so that in addition to sealing the tubing rests against the lower end of the adaptor ring it will also seal the couplings on the tubing against 5 and upon the upper edge of the flange 22, as leakage between the tubing and the body of the well as in the upper end of the annular recess 23 casinghead. and the lower surface of the recess 20;

The accompanying drawing shows on the right I have shown in dotted lines" the coupling 10 hand side an elevation and on the left hand side seated directly against the sealing ring 24. As a central vertical section of a casing head involvthe coupling is larger than the tubing 9 it stretches ing my invention. or distorts the sealing ring outwardly radially to 25 1 designates a hollow body or bowl having the take up much of the groove 25. It is thus seen so side outlets or vents 2. The lower end of the that the tubing with the coupling 10 thereon can casing head 1 is provided with internal threads be moved up and down through the casing head 3 by which a string of casing represented by the without breaking the Sea between the Coupling numeral 4 is suspended. 10 and the sealing ring 24. After the coupling Anadaptor ring 5 is screwed into the upper passes the sealing ring the latter will expand in- 85 portion of the body as shown by the threads 6, wardly so as to form a seal against the outer sur- A number of slips '1 are inserted in the adaptor face of the tubin ring 5 and have teeth 8 to grip and support the A marked advantage of the construction detubing 9 provided with the coupling 19. The scribed is the ease of assembly of the fiexible'sealinner face of the adaptor ring 5 is tapereddowning member or ring 24. This ring is first inserted wardly as shown at 11 while the outer faces of in the packer support 18 before the latter is the slips 7 are correspondingly tapered to fit screwed upon the adaptor ring 5. When the supthe taper in the adaptor ring. port 18 has been sufiiciently screwed upon the A retaining ring 12 is screwed into the upper adaptor ring 5, the latter with the support 18 and end of the adaptor ring 5 and may extend downthe sealing ring 24 therein can be readily inserted 95 wardly into recesses in the upper ends of the into the casing head 1. In order to prevent any acslips 7. The threads f r connecting th adaptor cidental turning of the support 18, I have provided ring and theretaining ring are shown at 13. 14 one or more set screws 26 in the upper end of the is a cylinder packing surrounding the tubing 9 support 18 to be screwed up against the adaptor and lying within the retaining ring 12. It rests ring 5 as shown.

upon the upper ends of the slips 7. A gland 15 I claim:- adjustable in the upper end of the retaining ring 1. A casing head comprising a body having an 12 by means of the threads 16 bears upon the axial bore, an adaptor ring secured within the upper face 1'7 of the packing 14 to compress the bore at the upper end of the body, slips supported same and form a tight seal between the tubing 9 by the ring and adapted to surround and suspend 105 and the retaining ring 12. T -a' well tubing, means above the slips to provide a i A tubular packer support 18 is adjustabl seal between tlre tubing and the ring, and a flexscrewed on the threads 19 in an annular recess ible sealing ring below said slips to provide a seal in the lower end of the adaptor ring 5. The between the tubing and the body, the sealing no lower end of the packer support has an annular means engaging the exterior wall of the tubing and being flexible to permit a coupling on the tubing to pass through with a sealing fit.

2. A casing head adapted to be secured to the upper end of a well casing including a bowl, an adaptor ring secured within the upper end of the bowl, slips supported by the ring and adapted to surround and suspend a well tubing having couplings thereon, means above the slips to provide a seal between the tubing and the ring, and means below the slips to provide a seal between the tubing or the coupling and the bowl, the sealing means being flexible to elastically grasp the outer surface of the tubing and to expand radially to permit the couplings on the tubing to pass with a sealing fit. v

3; A casing head comprising a hollow annular vented body, an adaptor ring secured within the upper end of the body, slips supported by the ring for suspending a well tubing having couplings thereon, a retaining ring above the slips supported by the adaptor ring, packing above the slips positioned between the retaining ring and the tubing, a gland adjustable in the retaining ring for compressing the packing, a packer support adjustably secured to the lower end of the adaptor ring, and a flexible sealing member secured between the lower end of the adaptor ring andthe packer support and normally contacting with the tubing, the sealing member being capable of stretching to allow the passage of the said tubing coupling therethrough while maintaining a. sealing fit therewith.

4. A casing head comprising a body having an axial bore, an adaptor ring secured within the bore at the upper end of the body, slips supported by the ring and adapted to surround and suspend a well tubing, means above the slips to provide a seal between the tubing and the ring, a tubular packer holder adjustably connected to the lower end of the adaptor ring and having at its lower end an annular upwardly-open groove therein, and an annular flexible packing ring adapted to surround and form a seal with the outer surface of the tubing and having its lower end confined in the groove, the packing being expansible radially to allow a coupling in the tubing to pass with a sealing flt.

5. A casing head comprising a body having an axial bore, an adaptor ring secured within the bore at the upper end of the body, slips supported by the ring and adapted to surround and suspend a well tubing, means above the slips to provide a seal between the tubing and the ring, a tubular packer holder adjustably connected to the lower end of the adaptor ring and having at its lower end an annular upwardly-open groove therein, and an annular flexible packing ring adapted to surround and form a seal with the outer surface of the tubing and having its lower end confined in the groove, the packing being grooved circumierentially intermediate its ends to allow it to expand radially and permit a coupling on the tubing to pass with a sealing fit.

- ARTHUR L. LEMAN. 

